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2022
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10
Common Failure Forms of Boring Drill Rod
The common failure modes of boring drill rods are respectively wear failure of R32 thread part, fracture of R32 thread root and fracture of the second buckle from R32 thread end face.
The common failure modes of boring drill rods are respectively wear failure of R32 thread part, fracture of R32 thread root and fracture of the second buckle from R32 thread end face. As shown in Figure 8, Figure 9, Figure 10. Bending and fracture of the drill rod shaft and fracture of the end of the drill rod linked with the drill rod are rare. In case of abnormal conditions such as operation, surrounding rock change and drill rod, etc. shall be analyzed emphatically.
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